[PATCH] Make sure therm_adt746x only handles known hardware

This patch limits therm_adt746x to currently existing fan controllers in
Apple laptops.  It may avoid problems with future hardware.

Signed-off-by: Colin Leroy <colin@colino.net>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 6 insertions, 0 deletions

diff --git a/drivers/macintosh/therm_adt746x.c b/drivers/macintosh/therm_adt746x.c
index e0ac63effa55..c7e84abe8951 100644
--- a/drivers/macintosh/therm_adt746x.c
+++ b/drivers/macintosh/therm_adt746x.c
@@ -545,6 +545,12 @@ thermostat_init(void)
         else
                 return -ENODEV;
 
+        prop = (u32 *)get_property(np, "hwsensor-params-version", NULL);
+        printk(KERN_INFO "adt746x: version %d (%ssupported)\n", *prop,
+                         (*prop == 1)?"":"un");
+        if (*prop != 1)
+                return -ENODEV;
+
         prop = (u32 *)get_property(np, "reg", NULL);
         if (!prop)
                 return -ENODEV;